Magnetic anisotropy and weak ferromagnetism of single-crystal TbNi{sub 2}B{sub 2}C
- Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (United States)
The anisotropic magnetization {ital M}({ital T}) of single-crystal TbNi{sub 2}B{sub 2}C is reported as a function of applied magnetic field ({ital H}) for temperatures {ital T} from 2 to 300 K and with {ital H} parallel and perpendicular to the {ital c} axis ({ital H}{parallel}{ital c} and {ital H}{perpendicular}{ital c}). In low field ({ital H}{le}100 G) TbNi{sub 2}B{sub 2}C orders antiferromagnetically at N{acute e}el temperature {ital T}{sub {ital N}}=(14.9{plus_minus}0.1) K. Weak ferromagnetic (WF) behavior is found for {ital T}{le}8 K and {ital H}{le}10 kG. Both phase transitions are also detected in zero-field in-plane resistivity {rho}{sub {ital ab}}({ital T}) measurements. In contrast, previous low-field {ital M}({ital T},{ital H}) data showed antiferromagnetic ground states for (Gd,Dy,Ho,Er,Tm)Ni{sub 2}B{sub 2}C crystals. The origin of the WF ordering, given the point symmetry (4/{ital mmm}) of the Tb{sup +3} ions, is addressed together with the observed in-plane anisotropy in the high-field magnetization. Possible reasons for the absence of superconductivity above 2 K in TbNi{sub 2}B{sub 2}C are also discussed. Finally, a partial {ital H}-{ital T} magnetic phase diagram of TbNi{sub 2}B{sub 2}C is presented for {ital H}{parallel}[110] and aspects of the similar {ital H}-{ital T} diagram for {ital H}{parallel}[100] are discussed. {copyright} {ital 1996 The American Physical Society.}
- Research Organization:
- Ames National Laboratory
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 279799
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 53, Issue 13; Other Information: PBD: Apr 1996
- Country of Publication:
- United States
- Language:
- English
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